Would I be right in thinking, having seen the packs of clay on the Hobbycraft website, that you have to roll out the colours you want to use then cut out the shapes you want and meld them together sort of? It's got to be quite thick I presume to be enough to turn down to the thickness required for the pen? And do you wrap the clay around the brass tube before it's baked in the oven? And what sort of time and what temperature does it need to be baked for and at?
Sorry for all the questions I just trying to get my head around this. 
